Facebook PHP getUser() returns 0
Strange. I did not touch any of the existing CodeIgniter (PHP) codes and why suddenly Facebook sign up no longer works ? After diff-ing around here and there, only then I realized that I've upgraded the PHP version from 5.3.x to 5.4.2.
The problem was that PHP 5.4.x makes a few changes to the php.ini file and this causes the Facebook PHP SDK to break. After authenticating the user, it will just display the current page but with an extra
?code=XXXXXXX
parameter appended at the back of the URL. Further investigation shows that $facebook->getUser() function will return 0 and thus break the existing code if-statement.
Facebook PHP SDK relies on $_REQUEST from the server and because of the breaking changes in PHP 5.4.x, it no longer worked the way it supposed to be.
To fix this problem, change the Facebook SDK getCode() function in base_facebook.php file.
from
<?php
protected function getCode() {
if (isset($_REQUEST['code'])) {
if ($this->state !== null &&
isset($_REQUEST['state']) &&
$this->state === $_REQUEST['state']) {
// CSRF state has done its job, so clear it
$this->state = null;
$this->clearPersistentData('state');
return $_REQUEST['code'];
}
else
{
self::errorLog('CSRF state token does not match one provided.');
return false;
}
}
return false;
}
?>
to
<?php
protected function getCode() {
$server_info = array_merge($_POST, $_GET, $_COOKIE);
if (isset($server_info['code'])) {
if ($this->state !== null &&
isset($server_info['state']) &&
$this->state === $server_info['state']) {
// CSRF state has done its job, so clear it
$this->state = null;
$this->clearPersistentData('state');
return $server_info['code'];
} else {
self::errorLog('CSRF state token does not match one provided.');
return false;
}
}
return false;
}
?>
The new code replaced $_REQUEST with a combined array of $_POST, $GET and $_COOKIE. This new changes worked and getUser() function no longer returns 0.
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+30.4k Golang : How to redirect to new page with net/http?
+17.1k Golang : Get number of CPU cores
+12.4k Golang : Display list of countries and ISO codes
+8k Golang : How to feed or take banana with Gorilla Web Toolkit Session package
+30.9k error: trying to remove "yum", which is protected
+12.4k Golang : List running EC2 instances and descriptions
+5.8k Golang : ROT32768 (rotate by 0x80) UTF-8 strings example
+8.8k Golang : Combine slices but preserve order example
+8.2k Golang : Variadic function arguments sanity check example
+10.7k Golang : Select region of interest with mouse click and crop from image
+6.8k Golang : Humanize and Titleize functions
+7.4k Golang : Check if one string(rune) is permutation of another string(rune)